#include "stdio.h"
#include <stdlib.h>

typedef struct rc4_key
{      
    unsigned char state[256];       
    unsigned char x;        
    unsigned char y;
} rc4_key;

void prepare_key(unsigned char *key_data_ptr,int key_data_len,rc4_key *key);
void rc4(unsigned char *buffer_ptr,int buffer_len,rc4_key * key);
